/**
 * Base class for creating an HTTP related exception.
 *
 * ```typescript
 * throw new HttpException(500, 'Server Error')
 * ```
 *
 * @internal
 */
export declare class HttpException extends Error {
    readonly code: number;
    readonly data?: any;
    /**
     * Create a new instance.
     *
     * @param code Http error code, ie 200, 400-500.
     * @param reason Error message.
     * @param data Extra data to add to the error.
     */
    constructor(code: number, reason: string, data?: any);
}
/**
 * Helper function for creating a 400 - Bad Request `HttpException`
 *
 * @internal
 * @param data Extra data to add to the error.
 */
export declare function badRequest(data?: any): HttpException;
/**
 * Helper function for creating a 404 - Not Found `HttpException`
 *
 * @internal
 * @param data Extra data to add to the error.
 */
export declare function notFound(data?: any): HttpException;